Fig. 2: Substrate scope of propargylamines.

Reaction conditions: 1 (0.2 mmol), 2a (0.4 mmol), KOt-Bu (0.2 mmol), KOH (0.4 mmol) were stirred in acetonitrile (2 mL) at 80 °C for 3 h under bench-top air atmosphere. Isolated yields were reported. Isolated yield of 10-fold scale in parenthesis.